3 * Controls the Moschip 7720 usb to dual port serial convertor
5 * Copyright 2006 Moschip Semiconductor Tech. Ltd.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, version 2 of the License.
12 * Vijaya Kumar <vijaykumar.gn@gmail.com>
13 * Ajay Kumar <naanuajay@yahoo.com>
14 * Gurudeva <ngurudeva@yahoo.com>
16 * Cleaned up from the original by:
17 * Greg Kroah-Hartman <gregkh@suse.de>
19 * Originally based on drivers/usb/serial/io_edgeport.c which is:
20 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
23 #include <linux/kernel.h>
24 #include <linux/errno.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27 #include <linux/tty.h>
28 #include <linux/tty_driver.h>
29 #include <linux/tty_flip.h>
30 #include <linux/module.h>
31 #include <linux/spinlock.h>
32 #include <linux/serial.h>
33 #include <linux/serial_reg.h>
34 #include <linux/usb.h>
35 #include <linux/usb/serial.h>
36 #include <linux/uaccess.h>
42 #define DRIVER_VERSION "1.0.0.4F"
43 #define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
44 #define DRIVER_DESC "Moschip USB Serial Driver"
46 /* default urb timeout */
47 #define MOS_WDR_TIMEOUT (HZ * 5)
49 #define MOS_PORT1 0x0200
50 #define MOS_PORT2 0x0300
51 #define MOS_VENREG 0x0000
52 #define MOS_MAX_PORT 0x02
53 #define MOS_WRITE 0x0E
56 /* Interrupt Rotinue Defines */
57 #define SERIAL_IIR_RLS 0x06
58 #define SERIAL_IIR_RDA 0x04
59 #define SERIAL_IIR_CTI 0x0c
60 #define SERIAL_IIR_THR 0x02
61 #define SERIAL_IIR_MS 0x00
63 #define NUM_URBS 16 /* URB Count */
64 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
66 /* This structure holds all of the local port information */
68 __u8 shadowLCR; /* last LCR value received */
69 __u8 shadowMCR; /* last MCR value received */
70 __u8 shadowMSR; /* last MSR value received */
72 struct async_icount icount;
73 struct usb_serial_port *port; /* loop back to the owner */
74 struct urb *write_urb_pool[NUM_URBS];
77 /* This structure holds all of the individual serial device information */
78 struct moschip_serial {
79 int interrupt_started;
84 #define USB_VENDOR_ID_MOSCHIP 0x9710
85 #define MOSCHIP_DEVICE_ID_7720 0x7720
86 #define MOSCHIP_DEVICE_ID_7715 0x7715
88 static struct usb_device_id moschip_port_id_table [] = {
89 { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
90 { } /* terminating entry */
92 MODULE_DEVICE_TABLE(usb, moschip_port_id_table);
96 * mos7720_interrupt_callback
97 * this is the callback function for when we have received data on the
100 static void mos7720_interrupt_callback(struct urb *urb)
104 int status = urb->status;
109 dbg("%s", " : Entering\n");
118 /* this urb is terminated, clean up */
119 dbg("%s - urb shutting down with status: %d", __func__,
123 dbg("%s - nonzero urb status received: %d", __func__,
128 length = urb->actual_length;
129 data = urb->transfer_buffer;
131 /* Moschip get 4 bytes
132 * Byte 1 IIR Port 1 (port.number is 0)
133 * Byte 2 IIR Port 2 (port.number is 1)
134 * Byte 3 --------------
135 * Byte 4 FIFO status for both */
137 /* the above description is inverted
138 * oneukum 2007-03-14 */
140 if (unlikely(length != 4)) {
141 dbg("Wrong data !!!");
148 if ((sp1 | sp2) & 0x01) {
149 /* No Interrupt Pending in both the ports */
150 dbg("No Interrupt !!!");
152 switch (sp1 & 0x0f) {
154 dbg("Serial Port 1: Receiver status error or address "
155 "bit detected in 9-bit mode\n");
158 dbg("Serial Port 1: Receiver time out");
161 dbg("Serial Port 1: Modem status change");
165 switch (sp2 & 0x0f) {
167 dbg("Serial Port 2: Receiver status error or address "
168 "bit detected in 9-bit mode");
171 dbg("Serial Port 2: Receiver time out");
174 dbg("Serial Port 2: Modem status change");
180 result = usb_submit_urb(urb, GFP_ATOMIC);
182 dev_err(&urb->dev->dev,
183 "%s - Error %d submitting control urb\n",
189 * mos7720_bulk_in_callback
190 * this is the callback function for when we have received data on the
193 static void mos7720_bulk_in_callback(struct urb *urb)
196 unsigned char *data ;
197 struct usb_serial_port *port;
198 struct moschip_port *mos7720_port;
199 struct tty_struct *tty;
200 int status = urb->status;
203 dbg("nonzero read bulk status received: %d", status);
207 mos7720_port = urb->context;
209 dbg("%s", "NULL mos7720_port pointer \n");
213 port = mos7720_port->port;
215 dbg("Entering...%s", __func__);
217 data = urb->transfer_buffer;
219 tty = tty_port_tty_get(&port->port);
220 if (tty && urb->actual_length) {
221 tty_buffer_request_room(tty, urb->actual_length);
222 tty_insert_flip_string(tty, data, urb->actual_length);
223 tty_flip_buffer_push(tty);
227 if (!port->read_urb) {
228 dbg("URB KILLED !!!");
232 if (port->read_urb->status != -EINPROGRESS) {
233 port->read_urb->dev = port->serial->dev;
235 retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
237 dbg("usb_submit_urb(read bulk) failed, retval = %d",
243 * mos7720_bulk_out_data_callback
244 * this is the callback function for when we have finished sending serial
245 * data on the bulk out endpoint.
247 static void mos7720_bulk_out_data_callback(struct urb *urb)
249 struct moschip_port *mos7720_port;
250 struct tty_struct *tty;
251 int status = urb->status;
254 dbg("nonzero write bulk status received:%d", status);
258 mos7720_port = urb->context;
260 dbg("NULL mos7720_port pointer");
264 dbg("Entering .........");
266 tty = tty_port_tty_get(&mos7720_port->port->port);
268 if (tty && mos7720_port->open)
275 * this function will be used for sending command to device
277 static int send_mos_cmd(struct usb_serial *serial, __u8 request, __u16 value,
278 __u16 index, void *data)
282 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
286 if (value < MOS_MAX_PORT) {
287 if (product == MOSCHIP_DEVICE_ID_7715)
288 value = value*0x100+0x100;
290 value = value*0x100+0x200;
293 if ((product == MOSCHIP_DEVICE_ID_7715) &&
295 dbg("serial->product== MOSCHIP_DEVICE_ID_7715");
300 if (request == MOS_WRITE) {
301 request = (__u8)MOS_WRITE;
302 requesttype = (__u8)0x40;
303 value = value + (__u16)*((unsigned char *)data);
305 pipe = usb_sndctrlpipe(serial->dev, 0);
307 request = (__u8)MOS_READ;
308 requesttype = (__u8)0xC0;
310 pipe = usb_rcvctrlpipe(serial->dev, 0);
313 status = usb_control_msg(serial->dev, pipe, request, requesttype,
314 value, index, data, size, MOS_WDR_TIMEOUT);
317 dbg("Command Write failed Value %x index %x\n", value, index);
322 static int mos7720_open(struct tty_struct *tty,
323 struct usb_serial_port *port, struct file *filp)
325 struct usb_serial *serial;
326 struct usb_serial_port *port0;
328 struct moschip_serial *mos7720_serial;
329 struct moschip_port *mos7720_port;
333 int allocated_urbs = 0;
336 serial = port->serial;
338 mos7720_port = usb_get_serial_port_data(port);
339 if (mos7720_port == NULL)
342 port0 = serial->port[0];
344 mos7720_serial = usb_get_serial_data(serial);
346 if (mos7720_serial == NULL || port0 == NULL)
349 usb_clear_halt(serial->dev, port->write_urb->pipe);
350 usb_clear_halt(serial->dev, port->read_urb->pipe);
352 /* Initialising the write urb pool */
353 for (j = 0; j < NUM_URBS; ++j) {
354 urb = usb_alloc_urb(0, GFP_KERNEL);
355 mos7720_port->write_urb_pool[j] = urb;
358 err("No more urbs???");
362 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
364 if (!urb->transfer_buffer) {
365 err("%s-out of memory for urb buffers.", __func__);
366 usb_free_urb(mos7720_port->write_urb_pool[j]);
367 mos7720_port->write_urb_pool[j] = NULL;
376 /* Initialize MCS7720 -- Write Init values to corresponding Registers
384 * 0x08 : SP1/2 Control Reg
386 port_number = port->number - port->serial->minor;
387 send_mos_cmd(port->serial, MOS_READ, port_number, UART_LSR, &data);
388 dbg("SS::%p LSR:%x\n", mos7720_port, data);
390 dbg("Check:Sending Command ..........");
393 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x01, &data);
395 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x02, &data);
398 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
400 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
403 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
405 mos7720_port->shadowLCR = data;
406 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
408 mos7720_port->shadowMCR = data;
409 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
411 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
414 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
416 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
419 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, port_number + 1, &data);
421 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
423 send_mos_cmd(port->serial, MOS_WRITE, MOS_MAX_PORT,
424 port_number + 1, &data);
427 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
429 data = data | (port->number - port->serial->minor + 1);
430 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
433 mos7720_port->shadowLCR = data;
434 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
436 send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);
438 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
440 mos7720_port->shadowLCR = data;
441 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
443 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
445 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
447 /* force low_latency on so that our tty_push actually forces *
448 * the data through,otherwise it is scheduled, and with *
449 * high data rates (like with OHCI) data can get lost. */
452 tty->low_latency = 1;
454 /* see if we've set up our endpoint info yet *
455 * (can't set it up in mos7720_startup as the *
456 * structures were not set up at that time.) */
457 if (!mos7720_serial->interrupt_started) {
458 dbg("Interrupt buffer NULL !!!");
460 /* not set up yet, so do it now */
461 mos7720_serial->interrupt_started = 1;
463 dbg("To Submit URB !!!");
465 /* set up our interrupt urb */
466 usb_fill_int_urb(port0->interrupt_in_urb, serial->dev,
467 usb_rcvintpipe(serial->dev,
468 port->interrupt_in_endpointAddress),
469 port0->interrupt_in_buffer,
470 port0->interrupt_in_urb->transfer_buffer_length,
471 mos7720_interrupt_callback, mos7720_port,
472 port0->interrupt_in_urb->interval);
474 /* start interrupt read for this mos7720 this interrupt *
475 * will continue as long as the mos7720 is connected */
476 dbg("Submit URB over !!!");
477 response = usb_submit_urb(port0->interrupt_in_urb, GFP_KERNEL);
480 "%s - Error %d submitting control urb\n",
484 /* set up our bulk in urb */
485 usb_fill_bulk_urb(port->read_urb, serial->dev,
486 usb_rcvbulkpipe(serial->dev,
487 port->bulk_in_endpointAddress),
488 port->bulk_in_buffer,
489 port->read_urb->transfer_buffer_length,
490 mos7720_bulk_in_callback, mos7720_port);
491 response = usb_submit_urb(port->read_urb, GFP_KERNEL);
493 dev_err(&port->dev, "%s - Error %d submitting read urb\n",
496 /* initialize our icount structure */
497 memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount));
499 /* initialize our port settings */
500 mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
502 /* send a open port command */
503 mos7720_port->open = 1;
509 * mos7720_chars_in_buffer
510 * this function is called by the tty driver when it wants to know how many
511 * bytes of data we currently have outstanding in the port (data that has
512 * been written, but hasn't made it out the port yet)
513 * If successful, we return the number of bytes left to be written in the
515 * Otherwise we return a negative error number.
517 static int mos7720_chars_in_buffer(struct tty_struct *tty)
519 struct usb_serial_port *port = tty->driver_data;
522 struct moschip_port *mos7720_port;
524 dbg("%s:entering ...........", __func__);
526 mos7720_port = usb_get_serial_port_data(port);
527 if (mos7720_port == NULL) {
528 dbg("%s:leaving ...........", __func__);
532 for (i = 0; i < NUM_URBS; ++i) {
533 if (mos7720_port->write_urb_pool[i] &&
534 mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
535 chars += URB_TRANSFER_BUFFER_SIZE;
537 dbg("%s - returns %d", __func__, chars);
541 static void mos7720_close(struct tty_struct *tty,
542 struct usb_serial_port *port, struct file *filp)
544 struct usb_serial *serial;
545 struct moschip_port *mos7720_port;
549 dbg("mos7720_close:entering...");
551 serial = port->serial;
553 mos7720_port = usb_get_serial_port_data(port);
554 if (mos7720_port == NULL)
557 for (j = 0; j < NUM_URBS; ++j)
558 usb_kill_urb(mos7720_port->write_urb_pool[j]);
560 /* Freeing Write URBs */
561 for (j = 0; j < NUM_URBS; ++j) {
562 if (mos7720_port->write_urb_pool[j]) {
563 kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
564 usb_free_urb(mos7720_port->write_urb_pool[j]);
568 /* While closing port, shutdown all bulk read, write *
569 * and interrupt read if they exists, otherwise nop */
570 dbg("Shutdown bulk write");
571 usb_kill_urb(port->write_urb);
572 dbg("Shutdown bulk read");
573 usb_kill_urb(port->read_urb);
575 mutex_lock(&serial->disc_mutex);
576 /* these commands must not be issued if the device has
577 * been disconnected */
578 if (!serial->disconnected) {
580 send_mos_cmd(serial, MOS_WRITE,
581 port->number - port->serial->minor, 0x04, &data);
584 send_mos_cmd(serial, MOS_WRITE,
585 port->number - port->serial->minor, 0x01, &data);
587 mutex_unlock(&serial->disc_mutex);
588 mos7720_port->open = 0;
590 dbg("Leaving %s", __func__);
593 static void mos7720_break(struct tty_struct *tty, int break_state)
595 struct usb_serial_port *port = tty->driver_data;
597 struct usb_serial *serial;
598 struct moschip_port *mos7720_port;
600 dbg("Entering %s", __func__);
602 serial = port->serial;
604 mos7720_port = usb_get_serial_port_data(port);
605 if (mos7720_port == NULL)
608 if (break_state == -1)
609 data = mos7720_port->shadowLCR | UART_LCR_SBC;
611 data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
613 mos7720_port->shadowLCR = data;
614 send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
622 * this function is called by the tty driver when it wants to know how many
623 * bytes of data we can accept for a specific port.
624 * If successful, we return the amount of room that we have for this port
625 * Otherwise we return a negative error number.
627 static int mos7720_write_room(struct tty_struct *tty)
629 struct usb_serial_port *port = tty->driver_data;
630 struct moschip_port *mos7720_port;
634 dbg("%s:entering ...........", __func__);
636 mos7720_port = usb_get_serial_port_data(port);
637 if (mos7720_port == NULL) {
638 dbg("%s:leaving ...........", __func__);
643 for (i = 0; i < NUM_URBS; ++i) {
644 if (mos7720_port->write_urb_pool[i] &&
645 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
646 room += URB_TRANSFER_BUFFER_SIZE;
649 dbg("%s - returns %d", __func__, room);
653 static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port,
654 const unsigned char *data, int count)
661 struct moschip_port *mos7720_port;
662 struct usb_serial *serial;
664 const unsigned char *current_position = data;
666 dbg("%s:entering ...........", __func__);
668 serial = port->serial;
670 mos7720_port = usb_get_serial_port_data(port);
671 if (mos7720_port == NULL) {
672 dbg("mos7720_port is NULL");
676 /* try to find a free urb in the list */
679 for (i = 0; i < NUM_URBS; ++i) {
680 if (mos7720_port->write_urb_pool[i] &&
681 mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
682 urb = mos7720_port->write_urb_pool[i];
689 dbg("%s - no more free urbs", __func__);
693 if (urb->transfer_buffer == NULL) {
694 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
696 if (urb->transfer_buffer == NULL) {
697 err("%s no more kernel memory...", __func__);
701 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
703 memcpy(urb->transfer_buffer, current_position, transfer_size);
704 usb_serial_debug_data(debug, &port->dev, __func__, transfer_size,
705 urb->transfer_buffer);
707 /* fill urb with data and submit */
708 usb_fill_bulk_urb(urb, serial->dev,
709 usb_sndbulkpipe(serial->dev,
710 port->bulk_out_endpointAddress),
711 urb->transfer_buffer, transfer_size,
712 mos7720_bulk_out_data_callback, mos7720_port);
714 /* send it down the pipe */
715 status = usb_submit_urb(urb, GFP_ATOMIC);
717 err("%s - usb_submit_urb(write bulk) failed with status = %d",
722 bytes_sent = transfer_size;
728 static void mos7720_throttle(struct tty_struct *tty)
730 struct usb_serial_port *port = tty->driver_data;
731 struct moschip_port *mos7720_port;
734 dbg("%s- port %d\n", __func__, port->number);
736 mos7720_port = usb_get_serial_port_data(port);
738 if (mos7720_port == NULL)
741 if (!mos7720_port->open) {
742 dbg("port not opened");
746 dbg("%s: Entering ..........", __func__);
748 /* if we are implementing XON/XOFF, send the stop character */
750 unsigned char stop_char = STOP_CHAR(tty);
751 status = mos7720_write(tty, port, &stop_char, 1);
756 /* if we are implementing RTS/CTS, toggle that line */
757 if (tty->termios->c_cflag & CRTSCTS) {
758 mos7720_port->shadowMCR &= ~UART_MCR_RTS;
759 status = send_mos_cmd(port->serial, MOS_WRITE,
760 port->number - port->serial->minor,
761 UART_MCR, &mos7720_port->shadowMCR);
767 static void mos7720_unthrottle(struct tty_struct *tty)
769 struct usb_serial_port *port = tty->driver_data;
770 struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
773 if (mos7720_port == NULL)
776 if (!mos7720_port->open) {
777 dbg("%s - port not opened", __func__);
781 dbg("%s: Entering ..........", __func__);
783 /* if we are implementing XON/XOFF, send the start character */
785 unsigned char start_char = START_CHAR(tty);
786 status = mos7720_write(tty, port, &start_char, 1);
791 /* if we are implementing RTS/CTS, toggle that line */
792 if (tty->termios->c_cflag & CRTSCTS) {
793 mos7720_port->shadowMCR |= UART_MCR_RTS;
794 status = send_mos_cmd(port->serial, MOS_WRITE,
795 port->number - port->serial->minor,
796 UART_MCR, &mos7720_port->shadowMCR);
802 static int set_higher_rates(struct moschip_port *mos7720_port,
806 struct usb_serial_port *port;
807 struct usb_serial *serial;
810 if (mos7720_port == NULL)
813 port = mos7720_port->port;
814 serial = port->serial;
816 /***********************************************
817 * Init Sequence for higher rates
818 ***********************************************/
819 dbg("Sending Setting Commands ..........");
820 port_number = port->number - port->serial->minor;
823 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
825 send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
827 send_mos_cmd(serial, MOS_WRITE, port->number, 0x02, &data);
829 mos7720_port->shadowMCR = data;
830 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
832 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
835 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
837 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
840 /***********************************************
841 * Set for higher rates *
842 ***********************************************/
845 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
848 send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
850 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
853 mos7720_port->shadowMCR = data;
854 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
856 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
858 /***********************************************
860 ***********************************************/
862 data = mos7720_port->shadowLCR | UART_LCR_DLAB;
863 mos7720_port->shadowLCR = data;
864 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
866 data = 0x001; /* DLL */
867 send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);
868 data = 0x000; /* DLM */
869 send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
871 data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
872 mos7720_port->shadowLCR = data;
873 send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
878 /* baud rate information */
879 struct divisor_table_entry {
884 /* Define table of divisors for moschip 7720 hardware *
885 * These assume a 3.6864MHz crystal, the standard /16, and *
887 static struct divisor_table_entry divisor_table[] = {
889 { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
890 { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
906 /*****************************************************************************
907 * calc_baud_rate_divisor
908 * this function calculates the proper baud rate divisor for the specified
910 *****************************************************************************/
911 static int calc_baud_rate_divisor(int baudrate, int *divisor)
919 dbg("%s - %d", __func__, baudrate);
921 for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
922 if (divisor_table[i].baudrate == baudrate) {
923 *divisor = divisor_table[i].divisor;
928 /* After trying for all the standard baud rates *
929 * Try calculating the divisor for this baud rate */
930 if (baudrate > 75 && baudrate < 230400) {
931 /* get the divisor */
932 custom = (__u16)(230400L / baudrate);
934 /* Check for round off */
935 round1 = (__u16)(2304000L / baudrate);
936 round = (__u16)(round1 - (custom * 10));
941 dbg("Baud %d = %d", baudrate, custom);
945 dbg("Baud calculation Failed...");
950 * send_cmd_write_baud_rate
951 * this function sends the proper command to change the baud rate of the
954 static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
957 struct usb_serial_port *port;
958 struct usb_serial *serial;
962 unsigned char number;
964 if (mos7720_port == NULL)
967 port = mos7720_port->port;
968 serial = port->serial;
970 dbg("%s: Entering ..........", __func__);
972 number = port->number - port->serial->minor;
973 dbg("%s - port = %d, baud = %d", __func__, port->number, baudrate);
975 /* Calculate the Divisor */
976 status = calc_baud_rate_divisor(baudrate, &divisor);
978 err("%s - bad baud rate", __func__);
982 /* Enable access to divisor latch */
983 data = mos7720_port->shadowLCR | UART_LCR_DLAB;
984 mos7720_port->shadowLCR = data;
985 send_mos_cmd(serial, MOS_WRITE, number, UART_LCR, &data);
987 /* Write the divisor */
988 data = ((unsigned char)(divisor & 0xff));
989 send_mos_cmd(serial, MOS_WRITE, number, 0x00, &data);
991 data = ((unsigned char)((divisor & 0xff00) >> 8));
992 send_mos_cmd(serial, MOS_WRITE, number, 0x01, &data);
994 /* Disable access to divisor latch */
995 data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
996 mos7720_port->shadowLCR = data;
997 send_mos_cmd(serial, MOS_WRITE, number, 0x03, &data);
1003 * change_port_settings
1004 * This routine is called to set the UART on the device to match
1005 * the specified new settings.
1007 static void change_port_settings(struct tty_struct *tty,
1008 struct moschip_port *mos7720_port,
1009 struct ktermios *old_termios)
1011 struct usb_serial_port *port;
1012 struct usb_serial *serial;
1024 if (mos7720_port == NULL)
1027 port = mos7720_port->port;
1028 serial = port->serial;
1029 port_number = port->number - port->serial->minor;
1031 dbg("%s - port %d", __func__, port->number);
1033 if (!mos7720_port->open) {
1034 dbg("%s - port not opened", __func__);
1038 dbg("%s: Entering ..........", __func__);
1040 lData = UART_LCR_WLEN8;
1041 lStop = 0x00; /* 1 stop bit */
1042 lParity = 0x00; /* No parity */
1044 cflag = tty->termios->c_cflag;
1045 iflag = tty->termios->c_iflag;
1047 /* Change the number of bits */
1048 switch (cflag & CSIZE) {
1050 lData = UART_LCR_WLEN5;
1055 lData = UART_LCR_WLEN6;
1060 lData = UART_LCR_WLEN7;
1065 lData = UART_LCR_WLEN8;
1069 /* Change the Parity bit */
1070 if (cflag & PARENB) {
1071 if (cflag & PARODD) {
1072 lParity = UART_LCR_PARITY;
1073 dbg("%s - parity = odd", __func__);
1075 lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1076 dbg("%s - parity = even", __func__);
1080 dbg("%s - parity = none", __func__);
1084 lParity = lParity | 0x20;
1086 /* Change the Stop bit */
1087 if (cflag & CSTOPB) {
1088 lStop = UART_LCR_STOP;
1089 dbg("%s - stop bits = 2", __func__);
1092 dbg("%s - stop bits = 1", __func__);
1095 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
1096 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
1097 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
1099 /* Update the LCR with the correct value */
1100 mos7720_port->shadowLCR &=
1101 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1102 mos7720_port->shadowLCR |= (lData | lParity | lStop);
1105 /* Disable Interrupts */
1107 send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
1111 send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);
1114 send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);
1116 /* Send the updated LCR value to the mos7720 */
1117 data = mos7720_port->shadowLCR;
1118 send_mos_cmd(serial, MOS_WRITE, port_number, UART_LCR, &data);
1121 mos7720_port->shadowMCR = data;
1122 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1124 send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1126 /* set up the MCR register and send it to the mos7720 */
1127 mos7720_port->shadowMCR = UART_MCR_OUT2;
1129 mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1131 if (cflag & CRTSCTS) {
1132 mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1133 /* To set hardware flow control to the specified *
1134 * serial port, in SP1/2_CONTROL_REG */
1137 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
1141 send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
1145 mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1148 data = mos7720_port->shadowMCR;
1149 send_mos_cmd(serial, MOS_WRITE, port_number, UART_MCR, &data);
1151 /* Determine divisor based on baud rate */
1152 baud = tty_get_baud_rate(tty);
1154 /* pick a default, any default... */
1155 dbg("Picked default baud...");
1159 if (baud >= 230400) {
1160 set_higher_rates(mos7720_port, baud);
1161 /* Enable Interrupts */
1163 send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
1167 dbg("%s - baud rate = %d", __func__, baud);
1168 status = send_cmd_write_baud_rate(mos7720_port, baud);
1169 /* FIXME: needs to write actual resulting baud back not just
1172 tty_encode_baud_rate(tty, baud, baud);
1173 /* Enable Interrupts */
1175 send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
1177 if (port->read_urb->status != -EINPROGRESS) {
1178 port->read_urb->dev = serial->dev;
1180 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1182 dbg("usb_submit_urb(read bulk) failed, status = %d",
1189 * mos7720_set_termios
1190 * this function is called by the tty driver when it wants to change the
1191 * termios structure.
1193 static void mos7720_set_termios(struct tty_struct *tty,
1194 struct usb_serial_port *port, struct ktermios *old_termios)
1198 struct usb_serial *serial;
1199 struct moschip_port *mos7720_port;
1201 serial = port->serial;
1203 mos7720_port = usb_get_serial_port_data(port);
1205 if (mos7720_port == NULL)
1208 if (!mos7720_port->open) {
1209 dbg("%s - port not opened", __func__);
1213 dbg("%s\n", "setting termios - ASPIRE");
1215 cflag = tty->termios->c_cflag;
1217 dbg("%s - cflag %08x iflag %08x", __func__,
1218 tty->termios->c_cflag,
1219 RELEVANT_IFLAG(tty->termios->c_iflag));
1221 dbg("%s - old cflag %08x old iflag %08x", __func__,
1222 old_termios->c_cflag,
1223 RELEVANT_IFLAG(old_termios->c_iflag));
1225 dbg("%s - port %d", __func__, port->number);
1227 /* change the port settings to the new ones specified */
1228 change_port_settings(tty, mos7720_port, old_termios);
1230 if (!port->read_urb) {
1231 dbg("%s", "URB KILLED !!!!!\n");
1235 if (port->read_urb->status != -EINPROGRESS) {
1236 port->read_urb->dev = serial->dev;
1237 status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1239 dbg("usb_submit_urb(read bulk) failed, status = %d",
1246 * get_lsr_info - get line status register info
1248 * Purpose: Let user call ioctl() to get info when the UART physically
1249 * is emptied. On bus types like RS485, the transmitter must
1250 * release the bus after transmitting. This must be done when
1251 * the transmit shift register is empty, not be done when the
1252 * transmit holding register is empty. This functionality
1253 * allows an RS485 driver to be written in user space.
1255 static int get_lsr_info(struct tty_struct *tty,
1256 struct moschip_port *mos7720_port, unsigned int __user *value)
1259 unsigned int result = 0;
1261 count = mos7720_chars_in_buffer(tty);
1263 dbg("%s -- Empty", __func__);
1264 result = TIOCSER_TEMT;
1267 if (copy_to_user(value, &result, sizeof(int)))
1272 static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1273 unsigned int __user *value)
1279 struct usb_serial_port *port;
1281 if (mos7720_port == NULL)
1284 port = (struct usb_serial_port *)mos7720_port->port;
1285 mcr = mos7720_port->shadowMCR;
1287 if (copy_from_user(&arg, value, sizeof(int)))
1292 if (arg & TIOCM_RTS)
1293 mcr |= UART_MCR_RTS;
1294 if (arg & TIOCM_DTR)
1295 mcr |= UART_MCR_RTS;
1296 if (arg & TIOCM_LOOP)
1297 mcr |= UART_MCR_LOOP;
1301 if (arg & TIOCM_RTS)
1302 mcr &= ~UART_MCR_RTS;
1303 if (arg & TIOCM_DTR)
1304 mcr &= ~UART_MCR_RTS;
1305 if (arg & TIOCM_LOOP)
1306 mcr &= ~UART_MCR_LOOP;
1310 /* turn off the RTS and DTR and LOOPBACK
1311 * and then only turn on what was asked to */
1312 mcr &= ~(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_LOOP);
1313 mcr |= ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0);
1314 mcr |= ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0);
1315 mcr |= ((arg & TIOCM_LOOP) ? UART_MCR_LOOP : 0);
1319 mos7720_port->shadowMCR = mcr;
1321 data = mos7720_port->shadowMCR;
1322 send_mos_cmd(port->serial, MOS_WRITE,
1323 port->number - port->serial->minor, UART_MCR, &data);
1328 static int get_modem_info(struct moschip_port *mos7720_port,
1329 unsigned int __user *value)
1331 unsigned int result = 0;
1332 unsigned int msr = mos7720_port->shadowMSR;
1333 unsigned int mcr = mos7720_port->shadowMCR;
1335 result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR: 0) /* 0x002 */
1336 | ((mcr & UART_MCR_RTS) ? TIOCM_RTS: 0) /* 0x004 */
1337 | ((msr & UART_MSR_CTS) ? TIOCM_CTS: 0) /* 0x020 */
1338 | ((msr & UART_MSR_DCD) ? TIOCM_CAR: 0) /* 0x040 */
1339 | ((msr & UART_MSR_RI) ? TIOCM_RI: 0) /* 0x080 */
1340 | ((msr & UART_MSR_DSR) ? TIOCM_DSR: 0); /* 0x100 */
1343 dbg("%s -- %x", __func__, result);
1345 if (copy_to_user(value, &result, sizeof(int)))
1350 static int get_serial_info(struct moschip_port *mos7720_port,
1351 struct serial_struct __user *retinfo)
1353 struct serial_struct tmp;
1358 memset(&tmp, 0, sizeof(tmp));
1360 tmp.type = PORT_16550A;
1361 tmp.line = mos7720_port->port->serial->minor;
1362 tmp.port = mos7720_port->port->number;
1364 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1365 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1366 tmp.baud_base = 9600;
1367 tmp.close_delay = 5*HZ;
1368 tmp.closing_wait = 30*HZ;
1370 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1375 static int mos7720_ioctl(struct tty_struct *tty, struct file *file,
1376 unsigned int cmd, unsigned long arg)
1378 struct usb_serial_port *port = tty->driver_data;
1379 struct moschip_port *mos7720_port;
1380 struct async_icount cnow;
1381 struct async_icount cprev;
1382 struct serial_icounter_struct icount;
1384 mos7720_port = usb_get_serial_port_data(port);
1385 if (mos7720_port == NULL)
1388 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
1392 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
1393 return get_lsr_info(tty, mos7720_port,
1394 (unsigned int __user *)arg);
1397 /* FIXME: These should be using the mode methods */
1401 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET",
1402 __func__, port->number);
1403 return set_modem_info(mos7720_port, cmd,
1404 (unsigned int __user *)arg);
1407 dbg("%s (%d) TIOCMGET", __func__, port->number);
1408 return get_modem_info(mos7720_port,
1409 (unsigned int __user *)arg);
1412 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
1413 return get_serial_info(mos7720_port,
1414 (struct serial_struct __user *)arg);
1417 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
1418 cprev = mos7720_port->icount;
1420 if (signal_pending(current))
1421 return -ERESTARTSYS;
1422 cnow = mos7720_port->icount;
1423 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1424 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1425 return -EIO; /* no change => error */
1426 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1427 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1428 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1429 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
1438 cnow = mos7720_port->icount;
1439 icount.cts = cnow.cts;
1440 icount.dsr = cnow.dsr;
1441 icount.rng = cnow.rng;
1442 icount.dcd = cnow.dcd;
1443 icount.rx = cnow.rx;
1444 icount.tx = cnow.tx;
1445 icount.frame = cnow.frame;
1446 icount.overrun = cnow.overrun;
1447 icount.parity = cnow.parity;
1448 icount.brk = cnow.brk;
1449 icount.buf_overrun = cnow.buf_overrun;
1451 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
1452 port->number, icount.rx, icount.tx);
1453 if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
1458 return -ENOIOCTLCMD;
1461 static int mos7720_startup(struct usb_serial *serial)
1463 struct moschip_serial *mos7720_serial;
1464 struct moschip_port *mos7720_port;
1465 struct usb_device *dev;
1469 dbg("%s: Entering ..........", __func__);
1472 dbg("Invalid Handler");
1478 /* create our private serial structure */
1479 mos7720_serial = kzalloc(sizeof(struct moschip_serial), GFP_KERNEL);
1480 if (mos7720_serial == NULL) {
1481 err("%s - Out of memory", __func__);
1485 usb_set_serial_data(serial, mos7720_serial);
1487 /* we set up the pointers to the endpoints in the mos7720_open *
1488 * function, as the structures aren't created yet. */
1490 /* set up port private structures */
1491 for (i = 0; i < serial->num_ports; ++i) {
1492 mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
1493 if (mos7720_port == NULL) {
1494 err("%s - Out of memory", __func__);
1495 usb_set_serial_data(serial, NULL);
1496 kfree(mos7720_serial);
1500 /* Initialize all port interrupt end point to port 0 int
1501 * endpoint. Our device has only one interrupt endpoint
1502 * comman to all ports */
1503 serial->port[i]->interrupt_in_endpointAddress =
1504 serial->port[0]->interrupt_in_endpointAddress;
1506 mos7720_port->port = serial->port[i];
1507 usb_set_serial_port_data(serial->port[i], mos7720_port);
1509 dbg("port number is %d", serial->port[i]->number);
1510 dbg("serial number is %d", serial->minor);
1514 /* setting configuration feature to one */
1515 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1516 (__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ);
1518 /* LSR For Port 1 */
1519 send_mos_cmd(serial, MOS_READ, 0x00, UART_LSR, &data);
1520 dbg("LSR:%x", data);
1522 /* LSR For Port 2 */
1523 send_mos_cmd(serial, MOS_READ, 0x01, UART_LSR, &data);
1524 dbg("LSR:%x", data);
1529 static void mos7720_shutdown(struct usb_serial *serial)
1533 /* free private structure allocated for serial port */
1534 for (i = 0; i < serial->num_ports; ++i) {
1535 kfree(usb_get_serial_port_data(serial->port[i]));
1536 usb_set_serial_port_data(serial->port[i], NULL);
1539 /* free private structure allocated for serial device */
1540 kfree(usb_get_serial_data(serial));
1541 usb_set_serial_data(serial, NULL);
1544 static struct usb_driver usb_driver = {
1545 .name = "moschip7720",
1546 .probe = usb_serial_probe,
1547 .disconnect = usb_serial_disconnect,
1548 .id_table = moschip_port_id_table,
1552 static struct usb_serial_driver moschip7720_2port_driver = {
1554 .owner = THIS_MODULE,
1555 .name = "moschip7720",
1557 .description = "Moschip 2 port adapter",
1558 .usb_driver = &usb_driver,
1559 .id_table = moschip_port_id_table,
1561 .open = mos7720_open,
1562 .close = mos7720_close,
1563 .throttle = mos7720_throttle,
1564 .unthrottle = mos7720_unthrottle,
1565 .attach = mos7720_startup,
1566 .shutdown = mos7720_shutdown,
1567 .ioctl = mos7720_ioctl,
1568 .set_termios = mos7720_set_termios,
1569 .write = mos7720_write,
1570 .write_room = mos7720_write_room,
1571 .chars_in_buffer = mos7720_chars_in_buffer,
1572 .break_ctl = mos7720_break,
1573 .read_bulk_callback = mos7720_bulk_in_callback,
1574 .read_int_callback = mos7720_interrupt_callback,
1577 static int __init moschip7720_init(void)
1581 dbg("%s: Entering ..........", __func__);
1583 /* Register with the usb serial */
1584 retval = usb_serial_register(&moschip7720_2port_driver);
1586 goto failed_port_device_register;
1588 info(DRIVER_DESC " " DRIVER_VERSION);
1590 /* Register with the usb */
1591 retval = usb_register(&usb_driver);
1593 goto failed_usb_register;
1597 failed_usb_register:
1598 usb_serial_deregister(&moschip7720_2port_driver);
1600 failed_port_device_register:
1604 static void __exit moschip7720_exit(void)
1606 usb_deregister(&usb_driver);
1607 usb_serial_deregister(&moschip7720_2port_driver);
1610 module_init(moschip7720_init);
1611 module_exit(moschip7720_exit);
1613 /* Module information */
1614 MODULE_AUTHOR(DRIVER_AUTHOR);
1615 MODULE_DESCRIPTION(DRIVER_DESC);
1616 MODULE_LICENSE("GPL");
1618 module_param(debug, bool, S_IRUGO | S_IWUSR);
1619 MODULE_PARM_DESC(debug, "Debug enabled or not");